diff --git a/layout/reftests/font-face/reftest.list b/layout/reftests/font-face/reftest.list
index 1af8457866c..ed29a2b7379 100644
--- a/layout/reftests/font-face/reftest.list
+++ b/layout/reftests/font-face/reftest.list
@@ -54,7 +54,7 @@ HTTP(..) == disable-sheet-1.html disable-sheet-1-ref.html
 HTTP(..) == disable-sheet-4.html disable-sheet-4-ref.html
 HTTP(..) == disable-sheet-5.html disable-sheet-4-ref.html
 HTTP(..) == sheet-set-base-1.html sheet-set-base-1-ref.html
-HTTP(..) == sheet-set-switch-1.html sheet-set-switch-1-ref.html
+fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") HTTP(..) == sheet-set-switch-1.html sheet-set-switch-1-ref.html
 HTTP(..) == insert-rule-1a.html insert-rule-1-ref.html
 HTTP(..) == insert-rule-1b.html insert-rule-1-ref.html
 HTTP(..) == delete-rule-1.html delete-rule-1-ref.html